Probably because old calendars (such as the Persian Calendar) used 360 days for a year-when they watched the stars they saw them revolve around the North Star one degree per day.
September 27, 2015 will bring a supermoon lunar eclipse at nightfall. The last lunar eclipse of this magnitude occurred in 1982, and the next one of a similar magnitude will be in 2033. A lesser lunar eclipse will come in 2018. The lunar eclipse part of this phenomenon, according CTV, is caused by the Earth inserting itself between the sun and the moon. As this happens, the Earth casts its shadow on the face of the moon.
Sky spectacle: Lunar eclipse features 'blood moon'. The shortest lunar eclipse of the century (according to NASA) featured a rare sight. The first of two lunar eclipses visible in the U.S. this year took place early Saturday morning. Skywatchers in the western third of the U.S. saw a total eclipse, while folks in the central and eastern U.S. only saw a partial eclipse before the moon sets. The first lunar eclipse of 2015 will be on April 4th at sunrise.